size up cheat sheets taken from other sources

advertisement

SIZING UP A FIRE
Hazard to firefighters
Topography
Equipment
Fuels
Snags
Changing weather
Biological
Urban interface
Rates of spread
Size of fire
Values at risk
Fire behavior

Fire Safety
o LOOKOUTS
o COMMUNICATIONS
o ESCAPE ROUTES
o SAFETY ZONES
ITEMS NEEDED FOR DEVELOPMENT OF A
SUPPRESSION STRATEGY

Tactics (discuss local strategy & tactics)
Resource limitation
Resources assignments
Support needs

Safety information
Size of fire ( discuss how to make size estimate)
Fuels
Weather - current and predicted

Topography - accessibility, safety, effects

Natural barriers

Human made barriers

Values at risk (life, property, resources)

Fire intensity
o direct
o parallel
o indirect..
An accurate and complete size-up must include
consideration of the following strategic factors.
A. Time of day
- sleeping occupants at night
- delays in response
- limited visibility at night
B. Life
- residential vs. commercial building
- occupied vs. vacant
- transient vs. permanent residents
- ambulatory vs. non-ambulatory occupants
C. Area
- large volume of fire
- long stretches
D. Height
- elevator operations
- standpipe stretches
- long stretches
E. Construction
- frame buildings
- Truss roof and floor beams
- fire resistive
- Old Law Tenements
F. Occupancy
- Public Assembly
- Health Care Facilities
- Hazardous Materials
- Fuel Loading
G. Location and extent of fire
- cellar, sub cellars
- cockloft
- dumbwaiter
H. Water supply
I. Street conditions
- construction
- elevated roadways and railways
- overhead wires
J. Auxiliary appliances
- standpipe systems
- sprinkler systems
K. Weather
- wind direction and velocity
- freezing conditions
- heat stress
L. Apparatus and equipment
- Large caliber streams (LCS)
- Large Diameter Hose (LDH)
- foam equipment
M. Exposures
-
six sides of the fire
4.2 PROTECTION OF LIFE
4.2.1 The protection of life is the primary consideration at any fireground
operation.
Engine companies are often confronted with life saving operations upon
arrival.
Life saving operations are placed ahead of firefighting when sufficient
firefighters
are not available to do both, as is the case when no ladder company is on the
scene. Judgment is a key factor when confronted with this situation. The best
life
saving measure may be a prompt attack on the fire which, if allowed to spread,
would trap occupants. A life hazard, visible upon arrival, must be addressed.
However, immediate rescue attempts by the first arriving engine company
without
simultaneously stretching and positioning a hoseline should be attempted only
in
extreme situations.
4.2.2 Factors impacting on the decision to attempt an immediate rescue
include:
The provisions of AUC 329 are complied with.
Occupants endangered by being in the immediate vicinity of the fire.
Number of persons trapped.
Occupants threatening to jump.
Means of egress cutoff by fire.
Ability to reach occupants with portable ladders.
Anticipated arrival time of the first due ladder company.
Staffing level of the engine company--four or five firefighters.
4.2.3 Actions that the officer of the first arriving engine company can
implement to
protect endangered occupants include:
Position a hoseline between the fire and the endangered occupants.
Ventilate to draw fire, heat, and smoke away from the endangered
occupants.
Give verbal instructions and assurances to the occupants.
Close doors to limit the spread of smoke.
Ensure that incoming units are informed of the location of endangered
occupants.
Rev. 10/6/00
FDNY DCN: 4.05.01 ENGINE COMPANY OPERATIONS
March 15, 1997 CHAPTER 4
4- 4
4.2.4 Depending on staffing, one member may be released from the stretch and
proceed
to the roof to provide vertical ventilation over the stairs. This action may
reduce
panic by relieving the smoke condition in the stairway. Proper tools must be
brought to the roof and access to the roof of the fire building shall be made in
accordance with established Department guidelines for the roof position.
4.3 LOCATING THE FIRE
4.3.1 Before any fire attack can be initiated, the exact location of the fire must
be
determined. This is the first stage of the fire suppression effort.
Refer to response printout and/or department radio for reported particulars,
i.e. floor or apartment number.
Upon arrival, an exterior survey of the building should be conducted for
visible flames, smoke, smoke blackened windows, occupants in distress,
fire escapes being utilized by fleeing occupants, etc.
Solicit information from occupants exiting via the interior stairs.
Listen to handie talkie radio traffic from ladder company personnel.
4.3.2 Often the odor given off by burning materials, even if there is no visible
smoke,
may indicate what is burning and perhaps indicate where the fire might be
located:
Wood and paint odor - apartment.
Food on the stove - apartment.
Fuel oil odor - boiler room or basement.
Rubbish odor - public hallway/stairway, compactor room, shafts.
Electrical odor - overhead lights in hallways.
4.3.3 While enroute to the reported fire location look out hallway windows or
up
stairwells for indications of fire or smoke.
4.3.4 If a particular apartment is suspected to be the fire location, but the door
is locked
and there are no visible indications of a fire, try jostling the door. Smoke might
puff out around the door casing.
4.3.5 When the exact location of the fire has been determined it must be
conveyed to
the other units operating on the scene. The most direct route to the fire area
must
be relayed to the members stretching the initial hoseline.
4.4 CONFINING/CONTROLLING THE FIRE
4.4.1 Confining and controlling a fire is the second stage of the fire
suppression effort
and includes those actions taken to prevent the fire from extending beyond the
area already involved. This is generally the immediate concern, and fulfills the
role of placing a hoseline between the fire and the majority of the building
occupants.
4.4.2 Confinement of the fire must take into consideration the intensity of the
fire as
well as the known or anticipated direction of fire spread. Be aware that the fire
may be extending via pipe recess, voids, concealed spaces, etc.
Rev. 10/6/00
FDNY DCN: 4.05.01 ENGINE COMPANY OPERATIONS
March 15, 1997 CHAPTER 4
4- 5
4.4.3 Depending on the type of building and the fire location, the first line
stretched and
operated may be committed to confining any fire extension while a subsequent
hoseline is utilized to extinguish the main body of fire.
Example: Fire in the cellar of an Old Law Tenement (OLT), the first line is
stretched into the first floor to protect the interior stairs and the second line is
stretched into the cellar to extinguish the fire. (FFP-MD’s Sec 4.2.1)
4.4.4 In some situations the closing of a door or window may play a vital role
in
confining the fire while hoselines are being stretched to the location.
4.5 EXTINGUISHING THE FIRE
4.5.1 Extinguishment is the third stage in the fire suppression effort.
4.5.2 Initial extinguishment includes “knock down” of visible flames and
readily
apparent burning and smoldering material debris. Final extinguishment means
that
any fire uncovered by “opening up” and overhauling procedures has been
extinguished.
4.6 STAGES OF FIRE GROWTH
4.6.1 In order to safely extinguish a fire, firefighters should be familiar with
the basic
concepts of fire, how fire develops and significant events which can occur
during
a fire. Fire growth in a room can be divided into three distinct stages: the
growth
stage (incipient), the fully developed stage (free-burning), and the decay stage
(smoldering).
4.6.2 Growth Stage (incipient)
During the growth stage a fire increases in size from small flames to full fire
that
involves the entire room. It may take several seconds to several hours for this
to
occur. Fire Growth is dependent on:
Combustible content (fuel load).
Oxygen supply (ventilation openings).
Size of room.
Insulation of room.
During the growth stage, flammable gases released by the burning material
collect
at the ceiling level and mix with oxygen. The heated gases are pushed under
pressure from the fire area into uninvolved areas. When this mixture ignites
flashes of flame can be seen in this layer of smoke. This condition is known as
rollover. Rollover should serve as a warning that the fire area may flashover.
As
the fire progresses through the growth stage and into the fully developed stage
the
potential for flashover exists. Flashover is defined as the sudden involvement
of a
room or area in flames from floor to ceiling caused by thermal radiation
feedback. Radiation feedback from the ceiling and walls heats the smoke and
gases given off by the burning materials and the combustible contents of the
room. When the contents have been heated to their ignition temperature,
sudden
and simultaneous ignition of the area can occur.
Rev. 12/15/97
FDNY DCN: 4.05.01 ENGINE COMPANY OPERATIONS
March 15, 1997 CHAPTER 4
4- 6
4.6.3 Fully Developed Stage (free-burning)
In the fully developed stage the entire room and contents are involved in fire.
If no
efforts were made to extinguish the fire, the fire would continue to burn until
the
available fuel and/or oxygen in the room or area was consumed. Because of
limited ventilation, most structure fires are air regulated, not fuel regulated.
This
means that fires will move into the decay stage due to insufficient oxygen.
Outside
fires are fuel regulated. How long and to what extent an outside fire burns is
controlled by the amount of fuel available, not oxygen.
4.6.4 Decay Stage (smoldering)
As available oxygen is consumed, the fire moves into the decay stage.
Although
some oxygen remains in the fire area, visible flames have started to diminish,
and
the fire continues to smolder. High heat and smoke conditions remain and the
potential for a backdraft is present. A backdraft is a smoke explosion which
can
occur when additional oxygen is introduced into a smoldering fire and the
heated
gases enter their flammable range and ignite with explosive force. Firefighters
must realize that a backdraft produces violent shock waves which can shatter
windows, blow down firefighters and collapse walls.
Warning signs of a possible backdraft include:
Heavy dense smoke with no visible flame in a tightly closed occupancy.
Black smoke pushing out around closed doors or window frames.
Glass stained with smoke condensation and pulsating from the pressure of
the fire.
Reversal of air movement pulling smoke back into a building through a
doorway.
Rev. 12/15/97